Use of track/layer morphology to develop functional parts by selective laser melting

Yadroitsev, Igor; Bertrand, Ph.; Antonenkova, G.; Grigoriev, S. N.; Smurov, I.

doi:10.2351/1.4811838

Cited by 68 publications

(47 citation statements)

References 22 publications

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“…Previous studies in the field of laser beam modulation have shown the possibility of obtaining uniform temperature fields in the heating zone with the use of Flat-top and Inverse Gaussian laser beam power density distribution [13]. Many scientists in their papers have mentioned nearly the same set of SLM process parameters including twelve positions associated with laser beam, gas atmosphere and powder parameters [14,15].…”

Section: Problem Statementmentioning

confidence: 99%

Laser beam profiling: experimental study of its influence on single-track formation by selective laser melting

Zhirnov

Podrabinnik

Okunkova

et al. 2015

Mechanics & Industry

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-In the article the experimental study of influences of laser beam profiling on the microstructure of the material obtained by selective laser melting is presented. Microstructure was researched by the example of single-track formation. For these needs the optical and video-monitoring stand was constructed. The defects of single-track formation were obtained by microscopy and video monitoring. The technological gaps for each laser beam profile give the possibility to use higher power for laser systems in the future with the purpose to improve productivity of SLM processing.

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Section: Problem Statementmentioning

confidence: 99%

Laser beam profiling: experimental study of its influence on single-track formation by selective laser melting

Zhirnov

Podrabinnik

Okunkova

et al. 2015

Mechanics & Industry

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“…Selective laser melting (SLM), as a newly developed direct digital manufacturing technology, has been treated as one of the most effective powder-based additive manufacturing (AM) methods for metal parts. [10][11][12][13][14][15][16][17] During SLM process, the 3D parts are built by selectively fusing and consolidation of the thin layers of powder using the high-energy laser beam in a layer-by-layer manner according to the computeraided design (CAD) models of the parts. Because of the unique processing mechanisms of SLM, e.g., a full melting of powder materials followed by a rapid solidification at a rate up to10 6 -10 8 K/s, 18 the molten materials tend to experience a particular nonequilibrium metallurgical process during SLM processing, thereby providing a capacity to produce unique aluminum-based nanocomposite parts.…”

Section: Journal Of Laser Applications Laser Additive Manufacturing Fmentioning

confidence: 99%

Densification behavior, microstructure evolution, and wear property of TiC nanoparticle reinforced AlSi10Mg bulk-form nanocomposites prepared by selective laser melting

Wang

Dai

et al. 2014

Journal of Laser Applications

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Selective laser melting (SLM), due to its unique additive manufacturing processing philosophy, demonstrates a high potential in producing bulk-form nanocomposites with novel nanostructures and enhanced properties. In this study, the nanoscale TiC particle reinforced AlSi10Mg nanocomposite parts were produced by SLM process. The influence of “laser energy per unit length” (LEPUL) on densification behavior, microstructural evolution, and wear property of SLM-processed nanocomposites was studied. It showed that using an insufficient LEPUL of 250 J/m lowered the SLM densification due to the balling effect and the formation of residual pores. The highest densification level (>98% theoretical density) was achieved for SLM-processed parts processed at the LEPUL of 700 J/m. The TiC reinforcement in SLM-processed parts experienced a structural change from the standard nanoscale particle morphology (the average size 75–92 nm) to the relatively coarsened submicron structure (the mean particle size 161 nm) as the applied LEPUL increased. The nanostructured TiC reinforcement was generally maintained within a wide range of LEPUL from 250 to 700 J/m and the dispersion state of nanoscale TiC reinforcement was homogenized with increasing LEPUL. The sufficiently high densification rate combined with the uniform distribution of nanoscale TiC reinforcement throughout the matrix led to the considerably low coefficient of friction of 0.38 and wear rate of 2.76 × 10−5 mm3 N−1 m−1 for SLM-processed nanocomposites at 700 J/m. Both the insufficient SLM densification response at a relatively low LEPUL of 250 J/m and the disappearance of nanoscale reinforcement at a high LEPUL of 1000 J/m lowered the wear performance of SLM-processed nanocomposite parts.

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“…В изделиях, полученных по технологии селек-тивного лазерного плавления, помимо специфич-ной структуры могут присутствовать дефекты -главным образом это микротрещины и поры [2,[13][14][15][16][17][18]. Последние разделяют на два основных вида.…”

Section: Introductionunclassified

“…Поры второго типа оказывают значительно большее влияние на механические свойства мате-риала вследствие их большего размера, а также пло-ской формы [13][14][15][16][17][18]. Для уменьшения пористости в конечных изделиях ответственного назначения применяется горячее изостатическое прессование, во многих случаях позволяющее существенно по-высить качество изделий после СЛП [19].…”

Section: Introductionunclassified

Anisotropy of Mechanical Properties of Products Manufactured Using Selective Laser Melting of Powdered Materials

Popovich¹,

Sufiiarov²,

Борисов³

et al. 2016

Izv. VUZ. Poroshk. Met.

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Рассмотрены причины возникновения анизотропии свойств в изделиях, изготавливаемых по технологии селективного лазерного плавления металлических порошковых материалов. Представлены результаты оценки механических свойств образцов из сплавов основе титана Ti-6Al-4V, ВТ6 и жаропрочного никелевого сплава Inconel 718 в различных направ-лениях. Исследована микроструктура компактных образцов, полученных селективным лазерным плавлением. Приведе-на зависимость их механических свойств от ориентации заготовок относительно рабочей платформы установки. Анализ микрошлифов из сплава Ti-6Al-4V показал, что у образца прямоугольной формы направление зеренной структуры со-ответствует направлению выращивания, тогда как при изготовлении тонких элементов сетчатой конструкции за счет их меньшего сечения протекают иные тепловые процессы, что сказывается на условиях кристаллизации и формирующейся микроструктуре: в зависимости от угла наклона элемента сетчатой конструкции изменяются направление и форма зерен. Anisotropy of mechanical properties of products manufactured using selective laser melting of powdered materialsThe paper examines factors leading to anisotropy of properties in products manufactured using lasercusing, a technology consisting in selective laser melting of metal powdered materials. The results obtained when evaluating mechanical properties of specimens made of titanium alloys Ti-6Al-4V, VT6 and heat-resistant nickel alloy Inconel 718 in different directions are presented. The study covers the microstructure of compact specimens obtained using selective laser melting, and describes dependence of their mechanical properties on workpiece orientation with relation to the unit working platform. The study of Ti-6Al-4V microsections showed that the direction of the rectangular specimen grain structure matched the growth direction, whereas thin elements with a lattice structure were made with other thermal processes due to their smaller cross section. This affected crystallization conditions and microstructure being formed: grain directions and shapes changed depending on the lattice structure element inclination.Keywords: additive manufacturing, selective laser melting, powder metallurgy, titanium alloys, nickel alloys, layer-by-layer manufacturing, anisotropy, mechanical properties. ВведениеТехнология селективного лазерного плавления (СЛП) уже сейчас активно применяется для из-готовления металлических изделий, что связано с возможностью производства заготовок, макси-мально близких по своей конфигурации к конеч-ному изделию, напрямую из компьютерной мо-дели, без использования оснастки. Это позволяет экономить материалы и затраты на последующую обработку, а также обеспечивает свободу выбо-ра формы изделий, которая может существенно повысить эксплуатационные характеристики де-талей [1]. Последнее особенно актуально в таких областях, как авиация и медицина. В авиации, где титановые и никелевые сплавы получили широ-кое распространение, предъявляются особенные требования к массе изделий. Применение адди-тивных технологий позволя...

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Use of track/layer morphology to develop functional parts by selective laser melting

Cited by 68 publications

References 22 publications

Laser beam profiling: experimental study of its influence on single-track formation by selective laser melting

Laser beam profiling: experimental study of its influence on single-track formation by selective laser melting

Densification behavior, microstructure evolution, and wear property of TiC nanoparticle reinforced AlSi10Mg bulk-form nanocomposites prepared by selective laser melting

Anisotropy of Mechanical Properties of Products Manufactured Using Selective Laser Melting of Powdered Materials

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